# coding=utf-8
# Copyright 2020 The Trax Authors.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

"""Trax math: pure numpy backend."""

from __future__ import absolute_import
from __future__ import division
from __future__ import print_function

import numpy as np


NUMPY_BACKEND = {
    'name': 'numpy',
    'np': np,
    'jit': lambda f: f,
    'random_get_prng': lambda seed: None,
    'random_split': lambda prng, num=2: (None,) * num,
    'expit': lambda x: 1. / (1. + np.exp(-x)),
}
